US4628293A - Sub-miniature fuse - Google Patents

Sub-miniature fuse Download PDF

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Publication number
US4628293A
US4628293A US06/708,532 US70853285A US4628293A US 4628293 A US4628293 A US 4628293A US 70853285 A US70853285 A US 70853285A US 4628293 A US4628293 A US 4628293A
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US
United States
Prior art keywords
fuse
holder
fuse wire
sub
conductors
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US06/708,532
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English (en)
Inventor
Werner Marx
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wickmann Werke GmbH
Original Assignee
Wickmann Werke GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wickmann Werke GmbH filed Critical Wickmann Werke GmbH
Assigned to WICKMANN WERKE GMBH reassignment WICKMANN WERKE GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MARX, WERNER
Application granted granted Critical
Publication of US4628293A publication Critical patent/US4628293A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
    • H01H85/02—Details
    • H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
    • H01H85/041—Fuses, i.e. expendable parts of the protective device, e.g. cartridges characterised by the type
    • H01H85/0411—Miniature fuses
    • H01H85/0415—Miniature fuses cartridge type
    • H01H85/0417—Miniature fuses cartridge type with parallel side contacts

Definitions

  • the present invention relates to a sub-miniature fuse of the type comprising a plastic base and two conductors passing through the base, which conductors are bridged by a fuse wire soldered thereto.
  • the invention is suitable for all fuses, in which a fuse wire is to be fixed in a transverse position thereto, as well as for any other electrical components, in the case of which some other conductor is to be fixed reliably to a first conductor which is at right angles thereto.
  • fuses in which a fuse wire is to be fixed in a transverse position thereto, as well as for any other electrical components, in the case of which some other conductor is to be fixed reliably to a first conductor which is at right angles thereto.
  • the invention is used in preferred manner for sub-miniature fuses of the aforementioned type, it will be explained hereinafter with sole reference to such fuses.
  • the fuse wire is soft soldered to the conductors in the vicinity of the ends of the pin-like conductors above the base. Particularly when using fuse wires made from very thin wires soldering is performed manually, in order to ensure a reliable and secure connection between the conductors and the fuse wire.
  • the transmitted heat can influence the soldering seam between the terminal pin and the fuse wire to such an extent that the soldering connection may even break.
  • a sub-miniature fuse comprising a plastic base, two conductors penetrating this base at the top and bottom thereof to extend upwardly and downwardly beyond the base, and a fuse wire bridging the conductors by being solder-secured thereto
  • a holder for the fuse wire is formed on each conductor on its extension above the base and the connection between the holder and the fuse wire is strengthened by melting on soft solder material.
  • the fuse wire is additionally secured by holding or receptacle means, which engage the fuse wire.
  • a mechanical or positive connection is formed between the fuse wire and each of the two conductors of the sub-miniature fuse before soft solder is applied to the joint additionally. It is sufficient if the fuse wire is initially only held in or on the holder and is then finally fixed by soft soldering. Accordingly there is a large number of possibilities for the construction of the holder and for performing its holding function.
  • the holder may be formed by rolling up or bending over the upper end of the conductor.
  • the fuse wire can be introduced into this loop-shaped holder either by subsequently drawing or hanging in, as a function of whether the holder wholly or only partly embraces the fuse wire, or the fuse wire is placed on the conductor before the latter is rolled up or bent over, so that following the shaping of the holder, the fuse wire is already located therein.
  • the upper end of the conductor is shaped flat, i.e. it is flattened.
  • recesses or notches are provided in the holder.
  • the conductors, whose cross-section is normally circular, are made flat for attaching the fuse wire, so that the holder embraces the fuse wire with a planar portion.
  • the notches are very important for the soldering quality, because the tin solder in this way adheres to the fuse wire not only on either side of the holder, but also reaches the fuse wire through the notch and produces additional bridges between the fuse wire and the holder and/or conductor.
  • the tin solder adheres much better to the resulting uneven or fissured surface of the holder than in the case of a smooth-surfaced holder construction.
  • This holder shape also leads to a certain capillary action when applying the liquid soft solder, which further improves the strength of the soldered joint.
  • a particularly economical method for the manufacture of the subminiature fuse comprises the steps that a plurality of bases with inserted conductors on whose upper ends the holders lateron are prepared are aligned side by side in a linear row, that a continuous fuse wire filament is applied in the stretched position and at a predetermined height with respect to the bases to the upper ends of the conductors essentially perpendicular thereto, that one holder, each is formed by rolling up or bending over the upper ends of the conductors for embracing and holding the fuse wire filament, that soft soldering material is applied to the holder and the fuse wire filament in this area and that the connecting pieces between the thus formed fuse wires of neighbouring fuses are removed. If necessary, the fixing area is then reground, cleaned and polished, after which the cap is placed and fixed onto the base.
  • the preparation for the shaping of the holder at the upper end of each conductor comprises, depending on the desired shape of the holder, for example a tilting action, namely a slight bending over of the conductor end if the holder is to be produced by rolling up.
  • the preparatory work prior to the fixing of the fuse wire filament also includes the flat shaping and producing of an elongated cutout in the conductor above the base. It is important to perform a simultaneous treatment of a plurality of units formed by bases with inserted conductors by arranging the bases side by side in an aligned manner in a device.
  • the fuse wire filament running simultaneously over the entire line of conductors is embraced and held by the holder in a combined operation during the production of the holder by rolling up or bending over the upper ends of the conductors, so that in a further operation the melting on of the tin solder can take place, followed by the severing of the thus formed fuse wire from the common filament, whereupon any remaining work can be performed.
  • FIG. 1 is a front view of a sub-miniature fuse base in the state of manufacture prior to rolling up conductors passing through the base;
  • FIG. 2 is a side view of the embodiment shown in FIG. 1 showing the next step of production;
  • FIG. 3 is a front view of the base after attaching a fuse wire to the conductors
  • FIG. 4 is a diagrammatic view of a device used in the production of the sub-miniature fuse.
  • a plastic base 1 having a circular cross-section is peripherally provided with ribs 2 along its periphery for attaching a known per se and thus not shown plastic cap, as well as with two pin-shaped conductors 3 passing through said base to extend beyond and below the latter and anchored therein.
  • the contact or terminal pins of said conductors, e.g. for connecting these conductors 3 have a flat shape above the base 1 and, as shown, have elongated cutouts 4.
  • These flat portions of the conductors 3 are rolled up incorporating a fuse wire 6 represented in dash-dotted lines, and forming a holder 5 embracing the fuse wire 6 as illustrated in FIG. 2, following a tilting action at point 7. Thereafter tin solder 8 is applied and projecting fuse wire portions are severed, so that a final state according to FIG. 3 is obtained.
  • a common processing of a plurality of units comprising bases 1 and conductors 3, in the manner diagrammatically shown in FIG. 4, said units are arranged side by side in an aligned form in a device 10 shaped like a bar. If the conductors 3 have been flattened prior to their insertion in the bases 1, the treatment in the device 10 commences by applying a fuse wire filament 9 in a stretched position to all the conductors 3. The rolling up of conductors 3 tilted at point 7 is then carried out in such a way that, as shown in FIG. 2, the fuse wire 6 is engaged resp. embraced by the holder 5.
  • the tin soft solder material is applied to the whole junction area between the holder 5 and the fuse wire 6, whereupon the fuse wires 6 are individualized, i.e. detached from the common filament and any work still necessary is carried out at the junction points, after which the not shown cap is placed on the base or socket 1 and attached thereto.
  • the same size of the loop-like holder 5 can be used for fuse wire of different diameters, for the tin solder material 8 will fill the gap between the fuse wire 6 and the holder 5 in all cases of which material the necessary quantity will flow into holder 5 in order to fill the gap in each case.
  • the tin solder 8 is drawn into the loop-shaped holder 5.
  • the holder 5 then provides a natural protection for the solder joint against any type of damage to the fixture, including direct mechanical action, especially during further manufacturing operations.

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  • Fuses (AREA)
  • Table Devices Or Equipment (AREA)
US06/708,532 1984-03-10 1985-03-05 Sub-miniature fuse Expired - Lifetime US4628293A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843408854 DE3408854A1 (de) 1984-03-10 1984-03-10 Kleinstsicherung und herstellungsverfahren hierfuer
DE3408854 1984-03-10

Publications (1)

Publication Number Publication Date
US4628293A true US4628293A (en) 1986-12-09

Family

ID=6230133

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/708,532 Expired - Lifetime US4628293A (en) 1984-03-10 1985-03-05 Sub-miniature fuse

Country Status (5)

Country Link
US (1) US4628293A (ja)
EP (1) EP0154801B1 (ja)
JP (1) JPS60258824A (ja)
AT (1) ATE42866T1 (ja)
DE (2) DE3408854A1 (ja)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287079A (en) * 1992-11-09 1994-02-15 Cooper Industries, Inc. Sub-miniature plastic fuse
GB2362705A (en) * 2000-04-12 2001-11-28 Chen Hsien Huang Fixing structure for safety fuse of christmas lamp
US20080143471A1 (en) * 2006-12-15 2008-06-19 Chun-Chang Yen Fuse assembly
US20090108980A1 (en) * 2007-10-09 2009-04-30 Littelfuse, Inc. Fuse providing overcurrent and thermal protection
US20100060406A1 (en) * 2006-06-16 2010-03-11 Smart Electronics Inc. Small-sized surface-mounted fuse and method of manufacturing the same
US20100148914A1 (en) * 2008-12-17 2010-06-17 Essie Rahdar Radial fuse base and assembly
US20120044038A1 (en) * 2009-04-21 2012-02-23 Smart Electronics Inc. Small fuse and manufacturing method thereof

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2204457A (en) * 1987-05-05 1988-11-09 Dubilier Plc Sub-miniature fuse
JPH0720828Y2 (ja) * 1989-06-14 1995-05-15 エス・オー・シー株式会社 超小型電流ヒューズ
DE9015208U1 (de) * 1990-11-05 1991-01-17 Wickmann-Werke GmbH, 5810 Witten Elektrische Sicherung
DE19803605B4 (de) * 1998-01-30 2004-08-26 Wickmann-Werke Gmbh Verfahren zur Herstellung elektrischer Sicherungen
DE102009019059A1 (de) * 2009-04-27 2010-11-04 Chun-Chang Yen Automatischer Fertigungsprozeß für die Basis einer Sicherung sowie eine geeignete Konstruktion für die Basis

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1008411A (en) * 1908-11-09 1911-11-14 Henry A Hills Safety device for electrically-heated implements.
US3123696A (en) * 1964-03-03 Cffalq l
US3253244A (en) * 1963-11-06 1966-05-24 Indak Mfg Corp Electrical resistors
US4434548A (en) * 1979-12-03 1984-03-06 Kenneth E. Beswick Limited Method of manufacturing plug-in electrical fuses
US4483064A (en) * 1982-07-22 1984-11-20 Bel Fuse, Inc. Process of multiple fuse construction

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR762124A (fr) * 1932-11-15 1934-04-04 Barette de coupe-circuit en matière isolante moulée avec cloisonnement évitant la propagation de l'arc électrique
FR948836A (fr) * 1947-06-19 1949-08-11 Procédé de fabrication de porte-fusibles
JPS5852289B2 (ja) * 1979-09-08 1983-11-21 エス・オ−・シ−株式会社 超速断型小型ヒユ−ズ
JPS56112856U (ja) * 1980-01-31 1981-08-31
JPS58184219A (ja) * 1982-04-21 1983-10-27 日本電気ホームエレクトロニクス株式会社 温度ヒユ−ズの製造方法
DE8411568U1 (de) * 1984-04-13 1984-08-23 Wickmann-Werke GmbH, 5810 Witten Miniatursicherung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3123696A (en) * 1964-03-03 Cffalq l
US1008411A (en) * 1908-11-09 1911-11-14 Henry A Hills Safety device for electrically-heated implements.
US3253244A (en) * 1963-11-06 1966-05-24 Indak Mfg Corp Electrical resistors
US4434548A (en) * 1979-12-03 1984-03-06 Kenneth E. Beswick Limited Method of manufacturing plug-in electrical fuses
US4483064A (en) * 1982-07-22 1984-11-20 Bel Fuse, Inc. Process of multiple fuse construction

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5287079A (en) * 1992-11-09 1994-02-15 Cooper Industries, Inc. Sub-miniature plastic fuse
GB2362705A (en) * 2000-04-12 2001-11-28 Chen Hsien Huang Fixing structure for safety fuse of christmas lamp
US20100060406A1 (en) * 2006-06-16 2010-03-11 Smart Electronics Inc. Small-sized surface-mounted fuse and method of manufacturing the same
US20080143471A1 (en) * 2006-12-15 2008-06-19 Chun-Chang Yen Fuse assembly
US20090108980A1 (en) * 2007-10-09 2009-04-30 Littelfuse, Inc. Fuse providing overcurrent and thermal protection
CN101483117A (zh) * 2007-10-09 2009-07-15 保险丝公司 提供过电流和热保护的熔断器
US20120299692A1 (en) * 2007-10-09 2012-11-29 Littelfuse, Inc. Fuse providing overcurrent and thermal protection
US9443688B2 (en) * 2007-10-09 2016-09-13 Littelfuse, Inc. Fuse providing overcurrent and thermal protection
US20100148914A1 (en) * 2008-12-17 2010-06-17 Essie Rahdar Radial fuse base and assembly
US8576041B2 (en) * 2008-12-17 2013-11-05 Cooper Technologies Company Radial fuse base and assembly
US20120044038A1 (en) * 2009-04-21 2012-02-23 Smart Electronics Inc. Small fuse and manufacturing method thereof
US9184011B2 (en) 2009-04-21 2015-11-10 Smart Electronics Inc. Method of manufacturing small fuse

Also Published As

Publication number Publication date
JPS60258824A (ja) 1985-12-20
EP0154801A3 (en) 1986-04-02
DE3570011D1 (en) 1989-06-08
EP0154801B1 (de) 1989-05-03
DE3408854A1 (de) 1985-09-12
EP0154801A2 (de) 1985-09-18
ATE42866T1 (de) 1989-05-15
JPH0542767B2 (ja) 1993-06-29

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Owner name: WICKMANN WERKE GMBH ANNENSTRASSE 113, 5810 WITTEN

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